Read the following except from a CNN poll published on May 10th 2018. Washington
ID: 3367480 • Letter: R
Question
Read the following except from a CNN poll published on May 10th 2018.
Washington (CNN) About three-quarters of Americans (77%) approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un, according to a new CNN pollconducted by SSRS. Trump's approval rating for handling the situation with North Korea has jumped 10 points since late March.
...
The CNN Poll was conducted by SSRS May 2-5 among a random national sample of 1,015 adults reached on landlines or cellphones by a live interviewer. Results for the full sample have a margin of sampling error of plus or minus 3.6 percentage points; it is larger for subgroups.
1. What type of parameter does the article make inference about?
Answers:
- Population Proportion
- Difference in Population Means
- Population Mean
- Difference in Population Proportions
2. What is the correct interpretation of the confidence interval found in #4.
.
- We are 95% confidence that the proportion of the sampled Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the mean of Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the mean of sampled Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the proportion of Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
Read the following except from a CNN poll published on May 10th 2018.
Washington (CNN) About three-quarters of Americans (77%) approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un, according to a new CNN pollconducted by SSRS. Trump's approval rating for handling the situation with North Korea has jumped 10 points since late March.
...
The CNN Poll was conducted by SSRS May 2-5 among a random national sample of 1,015 adults reached on landlines or cellphones by a live interviewer. Results for the full sample have a margin of sampling error of plus or minus 3.6 percentage points; it is larger for subgroups.
1. What type of parameter does the article make inference about?
Answers:
- Population Proportion
- Difference in Population Means
- Population Mean
- Difference in Population Proportions
2. What is the correct interpretation of the confidence interval found in #4.
Answers:.
- We are 95% confidence that the proportion of the sampled Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the mean of Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the mean of sampled Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
- We are 95% confidence that the proportion of Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
Explanation / Answer
1. Correct answer: Option (A) Populatio Proportion
2. 95% concidence interval: (0.77 - 0.036,0.77+0.036) = (0.734,0.806)
Correct answer: Option (D) We are 95% confidence that the proportion of Americans that approve of President Donald Trump's decision to meet with North Korean leader Kim Jong Un is within the interval found in question number 4.
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